In $Spirogyra$,which of the following statements is correct?
- AThe filaments showing scalariform conjugation are homothallic.
- BThe filaments showing lateral conjugation are homothallic.
- CThe filaments showing lateral conjugation are heterothallic.
- DAsexual reproduction occurs by zoospores.
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Which of the following algae produce carrageen?
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| $(C)$ Filamentous algae | $(r)$ Volvox |
| $(D)$ Colonial algae | $(s)$ Nostoc |
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